15 cards where the name includes “altar” and the card types include “artifact”

Ashnod's Altar (EMA)
Phyrexian Altar (2X2)
Altar of Dementia (MH1)
Altar of the Brood (KTK)
Altar of the Pantheon (THB)
Netherborn Altar (C20)
Altar of Bhaal // Bone Offering (CLB)
Transmogrant Altar (BRO)
Carnage Altar (C13)
Bloodsoaked Altar (M20)
Altar of the Goyf (MH2)
Baku Altar (BOK)
Altar of Shadows (MRD)
Altar Golem (EVE)
Altar of the Lost (DKA)

This search is finished. Now the real work can begin.